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The oxygen flux density of Ce 0.8 Gd 0.2 O 1.9 -x vol% MnFe 2 O 4 (CGO-xMFO) composite-type ceramics membranes has been investigated. The samples and reforming catalysts were prepared by the Pechini process. For the CGO-xMFO composites, oxygen permeation was observed even at x = 3 vol%, presumably due to the presence of grain boundary phases. For CGO-15MFO, the n-type electronic conductivity was found to be dominant at 900 • C or higher. The thickness dependence of jO 2 revealed that surface exchange kinetics was significantly involved in the case of the membrane thickness of L < 0.5 mm. The highest oxygen flux density of 10 µmol·cm −2 ·s −1 was achieved for CGO-15MFO with the 10 mass% Ni-Pr:CeO 2 catalyst (L = 0.25 mm) at 1000 • C and a flow rate of 270 sccm.

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